Design Example Report
Title
2.5W Adapter using LNK520P
Input: 90-265Vac
Specification
Output: 5.5V / 450mA
Cell Phone Charger
Application
Author
Power Integrations Applications Department
Document
Number
DER-39
Date
May 13, 2004
1.0
Revision
Summary and Features
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No optocoupler
Provides sloping output VI characteristic, making it an ideal low standby power
replacement for a linear transformer
Uses an EF12.6 transformer
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No Y1 safety capacitor required, giving very low earth leakage current
Meets CISPR-22B with large margin
Low component count
Less than 300mW standby consumption at 230 VAC
High efficiency
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found
at www.powerint.com.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com